Molt and aging criteria for four North American grassland passerines
By: Peter Pyle, Stephanie L. Jones, Janet M. Ruth.
Contributors: Jones, Stephanie L.; Ruth, Janet M.
Series: Biological technical publication -- BTP-R6011-2008
Publisher: U.S. Fish & Wildlife Service
Published: 2008
Place of publication: Shepherdstown, WV
Language: eng
Number of pages: 19
Subjects: Passeriformes -- Age determination -- North America; Passeriformes -- Physiology -- North America; Molting
Notes: "September 2008"--P. [4] cover.

Includes bibliographical references (p. 18).